A measurement system, a measurement device, and a measurement method being able to measure a flow speed for each position of an optical fiber are provided. According to one example embodiment, a measurement system includes: an object provided in a fluid, and generating a self-excited vibration by the fluid; an optical fiber provided in the fluid, and detecting the vibration; a light source outputting light P to the optical fiber; an acquisition unit acquiring backscattered light generated from the light P in the optical fiber and including a pattern indicating the vibration in a vibration position on the optical fiber to which the vibration of the fluid is transmitted; and a measurement unit measuring, from a pattern included in the backscattered light and indicating the vibration, a flow speed of the fluid in the vibration position.

Maximum flow setting. A method of limiting flow through a valve (1) comprising: reading a time series of signals from a flow sensor (5a, 5b); producing a time series of flow rates from the time series of signals; producing an averaged series of values; producing a first bounded series of values by replacing values that are below a lower threshold (13) with the lower threshold (13); producing a second bounded series of values by replacing values that exceed an upper threshold (15) with values that equal the upper threshold (15); producing a maximum flow rate by applying a moving maximum filter (17) to the second bounded series; reading a set point signal (9); limiting the set point signal (9) to the maximum flow rate; producing an actuation signal from the limited set point signal; transmitting the actuation signal to an actuator (7).

A measurement system includes: a tube; a bluff body, situated in the lumen of the tube, for generating vortices in a flowing fluid such that a Karman vortex street is formed downstream of the bluff body; a vortex sensor, having a mechanical resonant frequency, for providing a vortex sensor signal which changes over time and contains a first component representing the vortex shedding frequency and which contains a second component representing the mechanical resonant frequency of the vortex sensor; and transducer electronics for evaluating the at least one vortex sensor signal and configured to do the following: to determine vortex frequency measurement values representing the shedding frequency using the first component and, if the first component is not present, not to provide flow parameter measurement values and to generate a message indicating the current flow speed is not lower than the current acoustic velocity of the flowing fluid.

A field device (10) includes a sensor (11) that measures a physical quantity and outputs a measurement signal indicating a measured value, converters (12, 15, 16) that perform a predetermined conversion process on the measurement signal, and a processor (17) that outputs an output signal corresponding to the measurement signal subjected to the conversion process. The processor (17) starts verifying operational soundness of the converters (12, 15, 16) when the measurement signal subjected to the conversion process satisfies a predetermined condition, and outputs, while the operational soundness of the converters (12, 15, 16) is being verified, a signal corresponding to the measurement signal subjected to the conversion process and acquired immediately before the operational soundness of the converters (12, 15, 16) is verified, or a signal corresponding to the measurement signal indicating a predetermined measured value of the sensor (11), as the output signal.

A system and method for simulating activity of a fluid in a volume that represents a physical space, the activity of the fluid in the volume being simulated so as to model movement of elements within the volume. The method includes at a first time, identifying a first set of vortices in a transient and turbulent flow. The method includes at a second time that is subsequent to the first time, identifying a second set of vortices. The method includes tracking changes in the vortices by comparing the first set and the second set of discrete vortices. The method includes identifying one or more noise sources based on the tracking. The method includes determining the contribution of one or more noise sources at a receiver. The method also includes outputting data indicating one or more modifications to one or more geometric features of a device or an entity.

In various embodiments, a device for determining a property of a fluid may be provided. The device may include a fluid receiving structure configured to receive the fluid having a first condition. The device may further include a flow control structure coupled to the fluid receiving structure. The flow control structure may be configured to change the first condition of the fluid to a second condition. The device may further include a determination mechanism configured to determine the property of the fluid based on the second condition. The device may also include a voltage generation mechanism a voltage generation mechanism configured to generate a voltage based on the second condition.

A measurement system includes: a tube; a bluff body, situated in the lumen of the tube, for generating vortices in a flowing fluid such that a Kármán vortex street is formed downstream of the bluff body; a vortex sensor, having a mechanical resonant frequency, for providing a vortex sensor signal which changes over time and contains a first component representing the vortex shedding frequency and which contains a second component representing the mechanical resonant frequency of the vortex sensor; and transducer electronics for evaluating the at least one vortex sensor signal and configured to do the following: to determine vortex frequency measurement values representing the shedding frequency using the first component and, if the first component is not present, not to provide such flow parameter measurement values and to generate a message indicating the current flow speed is not lower than the current acoustic velocity of the flowing fluid.

Method for operating a vortex flowmeter device for measuring the flow of a fluid that flows through a measuring tube in which a baffle is arranged for producing eddies in the fluid. A signal-processing device processes signals of first and sensors produced by pressure fluctuations. A first signal is obtained by multiplication of the signal of the first sensor with a correction factor, and the second signal is obtained by multiplication of the signal of the second sensor with another correction factor such that a wanted signal is obtained from the deviation between the first signal and second signals, and a sum signal is formed from the sum of the first and second signals. A correlation between the wanted signal and the sum signal is determined and the correlation is minimized by variation of the correction factors, whereby same-phase interfering signals superimposed on anti-phase sensor signals are at least minimized.

A hybrid flow meter includes a fluid obstruction element, two or more pressure ports, a support member, and a vortex shedding sensor system. The fluid obstruction element is placed in a fluid conduit, and includes a cone-shaped member having a pair of frusto-conical portions joined at their larger ends. The pressure ports provide measurement points for measuring a change in fluid pressure caused by the fluid obstruction element. The support member for the fluid obstruction element extends across the entire diameter of the fluid conduit, and is shaped to function as a vortex shedding bluff body, holds in place the fluid obstruction element. The vortex shedding sensor system provides a measurement point for measuring a vortex shedding frequency generated by the support member.

A vibronic sensor for monitoring a flowable medium, comprising: an oscillator to which a medium surrounding the oscillator can be applied; at least one electromechanical transducer for exciting the oscillator to mechanical vibrations in accordance with driver signals and/or for outputting transducer signals that depend on vibrations of the oscillator; an operating and evaluating unit for providing the driver signals for driving the electromechanical transducer, for capturing the transducer signals, and for determining the presence, the density, and/or the viscosity of the medium in accordance with the transducer signals, wherein the operating and evaluating unit is designed to detect whether the medium in the pipe has a flow velocity above a limit value on the basis of time-varying modifications of the transducer signals.